<!DOCTYPE html>
<html lang="en">

<head>
    <title>html5</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>


<body>
    <p>计数：<output id="result"></output></p>
    <button onclick="startWorker()">开始工作</button>
    <button onclick="stopWorker()">停止工作</button>
    <p>
        <strong>注意：</strong> Internet Explorer 9 及更早
        IE 版本浏览器不支持 WebWorkers.
    </p>

    <script>
        var w;
        function startWorker() {
            if (typeof (Worker) !== "undefined") {
                if (typeof (w) == "undefined") {
                    w = new Worker("demo_workers.js");
                }
                w.onmessage = function (event) {
                    document.getElementById("result").innerHTML = event.data;
                };
            } else {
                document.getElementById("result").innerHTML = "抱歉，你的浏览器不支持 Web Workers...";
            }
        }
        function stopWorker() {
            w.terminate();
            w = undefined;
        }
    </script>
</body>

</html>